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- Currently, MCAsmInfo provides a CommentString attribute, that various targets can set, so that the AsmLexer can appropriately lex a string as a comment based on the set value of the attribute. - However, AsmLexer also supports a few additional comment syntaxes, in addition to what's specified as a CommentString attribute. This includes regular C-style block comments (/* ... */), regular C-style line comments (// .... ) and #. While I'm not sure as to why this behaviour exists, I am assuming it does to maintain backward compatibility with GNU AS (see https://sourceware.org/binutils/docs/as/Comments.html#Comments for reference) For example: Consider a target which sets the CommentString attribute to '*'. The following strings are all lexed as comments. ``` "# abc" -> comment "// abc" -> comment "/* abc */ -> comment "* abc" -> comment ``` - In HLASM however, only "*" is accepted as a comment string, and nothing else. - To achieve this, an additional attribute (`AllowAdditionalComments`) has been added to MCAsmInfo. If this attribute is set to false, then only the string specified by the CommentString attribute is used as a possible comment string to be lexed by the AsmLexer. The regular C-style block comments, line comments and "#" are disabled. As a final note, "#" will still be treated as a comment, if the CommentString attribute is set to "#". Depends on https://reviews.llvm.org/D99277 Reviewed By: abhina.sreeskantharajan, myiwanch Differential Revision: https://reviews.llvm.org/D99286 |
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| AsmParser | ||
| BinaryFormat | ||
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